US7644599B2 - Method for surface blasting cavities, particularly cavities in gas turbines - Google Patents
Method for surface blasting cavities, particularly cavities in gas turbines Download PDFInfo
- Publication number
- US7644599B2 US7644599B2 US11/792,756 US79275605A US7644599B2 US 7644599 B2 US7644599 B2 US 7644599B2 US 79275605 A US79275605 A US 79275605A US 7644599 B2 US7644599 B2 US 7644599B2
- Authority
- US
- United States
- Prior art keywords
- component
- shot balls
- cavity
- going
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/005—Vibratory devices, e.g. for generating abrasive blasts by ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/47—Burnishing
- Y10T29/479—Burnishing by shot peening or blasting
Definitions
- the invention relates to a method for the surface blasting of hollow spaces or cavities, especially cavities of gas turbines.
- Gas turbines especially aircraft engines, have at least one rotor equipped with rotating runner or rotor blades especially in the area of a compressor as well as a turbine, whereby the rotor blades are increasingly embodied as an integral component of the rotor.
- Integral bladed rotors are also designated as “blisk” (bladed disk) or “bling” (bladed ring).
- blisk bladed disk
- bling bladed ring
- through-going bored holes extending in the radial direction, for fluids, for example oil, are generally integrated in such rotors.
- Such through-going bored holes are also designated as “bleed holes” and represent hollow spaces or cavities with small cross-sectional areas.
- bored holes extend in the axial direction and often serve for the screwing connection, whereby these bored holes similarly represent highly loaded zones or areas of compressor and turbine.
- Further cavities with small-cross sectional areas are, for example, located between neighboring rotor disks of a gas turbine rotor.
- the rotors are densified or hardened by special surface treating or processing methods. In that regard, it is of significance to densify or harden also the surfaces of the above described cavities with small cross-sectional areas and the associated transition radii.
- the shot peening or shot blasting is usually used according to the state of the art, whereby the shot balls are accelerated with the aid of an airstream or a centrifuge.
- the problems arises that especially corners or transition areas of the through-going bored holes between a surface of the rotor and an inner surface of the through-going bored holes are subjected to a strong plastic material deformation, whereby the ductility of the material in the area of the through-going bored holes can be reduced and thus disadvantageously influenced.
- the methods for the surface blasting known from the state of the art are thus suitable only with great limitations for the treatment of cavities with especially tight cross-sectional areas.
- the problem underlying the present invention is to provide a novel method for the surface blasting of cavities, especially cavities of gas turbines.
- the vibrator is preferably positioned at a small spacing distance, preferably a spacing distance on the order of magnitude of the diameter of the shot balls used for the blasting, away from the cavity that is to be blasted.
- the or each ultrasonic vibrator is operated or driven with a frequency between 10 kHz and 50 kHz, especially with a frequency between 20 kHz and 40 kHz, whereby preferably shot balls with high density and hardness of a ceramic material, especially of tungsten carbide, are used for the blasting.
- the method is utilized in the blasting of through-going bored holes extending in the radial direction of a gas turbine rotor or of connecting bored holes extending in the axial direction with a relatively small cross-sectional area of especially 5 mm 2 to 100 mm 2 , whereby such a through-going bored hole is first blasted in a transition area between a component surface and an inner surface of the through-going bored hole, and is then blasted in the area of the inner surface, whereby shot balls with a diameter between 0.2 mm and 5 mm, especially between 0.4 mm and 1 mm, are used for the blasting, and whereby the vibrator is operated or driven with a frequency between 10 kHz and 50 kHz, especially at 20 kHz, for the blasting of a radially outward lying transition area between the component surface and the inner surface of the through-going bored hole as well as for the blasting of the inner surface, whereas however the ultrasonic vibrator is operated or driven with a frequency between 10 kHz and 50
- FIG. 1 shows a strongly schematized illustration of a component with two through-going bored holes to be blasted
- FIG. 2 shows the blasting of a corner area or transition area between a component surface and an inner surface of the through-going bored hole of the component of the FIG. 1 ;
- FIG. 3 shows the blasting of the inner surface of the through-going bored hole of the component of the FIG. 1 ;
- FIG. 4 shows a strongly schematized illustration of an integral bladed gas turbine rotor during the blasting, from radially inside, of a through-going bored hole extending in the radial direction;
- FIG. 5 shows a strongly schematized illustration of an integral bladed gas turbine rotor during the blasting, from radially outside, of a through-going bored hole extending in the radial direction;
- FIG. 6 shows a strongly schematized illustration of a gas turbine rotor during the blasting, from radially inside, of a cavity between two rotor disks.
- FIG. 1 shows a disk-shaped embodied component 10 with two through-going bored holes 11 and 12 .
- the through-going bored holes 11 and 12 are bored holes with a relatively small cross-sectional area, especially with a cross-sectional area of 5 mm 2 to 100 mm 2 .
- the through-going bored holes 11 , 12 comprise an oval cross-sectional area with a length of 3.8 mm and a width of 1.2 mm.
- the dimensions of the through-going bored holes 11 , 12 are very small.
- the shot balls are accelerated with the aid of at least one ultrasonic vibrator, especially with the aid of a so-called ultrasonic sonotrode whereby the thusly accelerated shot balls are then directed onto the surfaces of the cavity to be blasted.
- the or each ultrasonic vibrator is operated or driven with a frequency between 10 kHz and 50 kHz, especially with a frequency between 20 kHz and 40 kHz.
- shot balls of a ceramic material preferably of tungsten carbide
- Shot balls of a steel alloy preferably of a 100Cr6 material
- the shot balls used for the blasting preferably have a polished surface and a diameter that is matched or adapted to the dimensions of the cavity to be blasted.
- shot balls with a diameter between 0.2 mm and 5 mm, especially between 0.4 mm and 1 mm, are used for the blasting of the through-going bored holes 11 , 12 with small cross-sectional areas as described with reference to FIG. 1 .
- corner areas or transition areas between a surface 13 of the component 10 and an inner surface 14 of the through-going bored holes 11 or 12 are blasted.
- the corner areas or transition areas are identified in FIG. 1 by the reference number 15 and form, in the illustrated example embodiment, a radii-shaped transition between the surface 13 of the component 10 and the inner surface 14 of the respective bored hole 11 or 12 .
- the blasting of the inner surfaces 14 of the through-going bored holes 11 and 12 occurs.
- FIG. 2 For the blasting of the corner areas or the transition areas 15 between the surface 13 of the component 10 and the inner surface 14 of the through-going bored holes 11 or 12 , one proceeds as shown in FIG. 2 .
- An ultrasonic vibrator namely an ultrasonic sonotrode 16 , is arranged for this purpose in the area of a surface 13 of the component 10 with a small spacing distance relative to the through-going bored hole 11 or 12 that is to be blasted.
- the through-going bored hole 11 or 12 is closed with a closure plug 17 .
- the closure plug 17 can reach into the through-going bored hole 11 or 12 with a projection 18 according to FIG. 2 .
- the areas of the surface 13 which do not belong to the transition area 15 of the through-going bored holes 11 or 12 that is to be blasted, are covered with the aid of a cover 19 , whereby the cover 19 simultaneously can form a spacer or spacing member for maintaining the spacing distance between the sonotrode 16 and the component 10 .
- the spacing distance between the sonotrode 16 and the surface 13 of the component 10 during the blasting of the transition areas 15 lies in the range of a few millimeters, preferably in the range of the five-fold to fifty-fold diameter of the shot balls 20 used for the blasting.
- shot balls 20 with a diameter between 0.4 mm and 1 mm are used for the blasting of such through-going bored holes.
- a sonotrode 16 is positioned with a small spacing distance relative to the surface 13 of the component 10 , whereby the entire surface 13 and therewith also the transition area 15 that was previously blasted in the sense of FIG. 2 are covered by a cover 21 .
- the cover 21 moreover again forms a spacer or spacing member for maintaining a defined spacing distance between the sonotrode 16 and the component 10 .
- a smaller spacing distance is maintained between the sonotrode 16 and the surface 13 of the component 10 , as can be seen from a comparison of the FIGS.
- this spacing distance lies on the order of magnitude of the diameter of the shot balls used for the blasting, especially on the order of magnitude of half the diameter thereof.
- the through-going bored holes 11 or 12 are closed by a closure plug 22 , whereby the closure plug 22 does not, however, project into the through-going bored hole 11 or 12 .
- FIGS. 4 and 5 show a rotor disk 23 of an integral bladed rotor, whereby the rotor blades of the integral blades rotor 23 are identified with the reference number 24 .
- through-going bored holes 25 extending in the radial direction are integrated into the rotor disk 23 , whereby the through-going bored holes serve for the passage of fluids, especially of oil.
- the through-going bored holes 25 can be compared with the through-going bored holes 11 or 12 according to FIG. 1 with regard to their geometrical dimensions, so that one may in principle proceed as described in connection with FIGS. 1 to 3 for the blasting of the through-going bored holes 25 , which extend in the radial direction, of the rotor disk 23 .
- FIG. 4 shows the blasting, from radially inside, of the through-going bored holes 25 , which extend in the radial direction, of the rotor disk 23
- FIG. 5 shows the blasting of the same from radially outside.
- an ultrasonic vibrator namely an ultrasonic sonotrode 26
- a frequency from 10 kHz to 50 kHz, especially at 20 kHz for the blasting of the radially outwardly lying corner areas or transition areas between a radially outwardly lying surface of the rotor disk 23 and an inner surface of the through-going bored holes 25 as well as for the blasting of the inner surfaces of the through-going bored holes 25 .
- the ultrasonic sonotrode 26 is operated or driven with a frequency of 10 kHz to 50 kHz, especially at 40 kHz.
- the number of the shot balls used for the blasting and the time duration of the ultrasonic shot blasting are determined dependent on the desired internal residual stress profile to be achieved and the size of the cavity to be blasted.
- FIG. 6 shows a cut-out section of a gas turbine rotor 29 which comprises two neighboring rotor disks 30 as well as 31 .
- a hollow space or cavity 32 between the two neighboring rotor disks 30 as well as 31 can also be densified or hardened with the aid of shot balls 33 , which are accelerated by an ultrasonic vibrator, namely, an ultrasonic sonotrode 34 .
- shot balls of tungsten carbide or a 100Cr6 material are used, which comprise a larger diameter in distinction to the surface blasting of through-going bored holes.
- shot balls with a diameter of 0.5 mm to 6 mm, preferably 2 mm are used for the surface blasting of the cavity 32 .
- a bounded or limited blasting cavity can be formed by two separating disks that are to be introduced into the cavity to be blasted, wherein the ultrasonic sonotrode forms the deepest point in the limited blasting cavity. It is pointed out that not only the cavity between the two rotor disks 30 and 31 , as described above, can be blasted, but rather also the side flanks 35 or 36 of the rotor disk 30 or 31 .
- an ultrasonic shot blasting process is proposed for the surface densification or hardening of cavities, whereby the shot balls are accelerated with the aid of an ultrasonic vibrator, namely with the aid of an ultrasonic sonotrode.
- the diameter of the shot balls is matched or adapted to the cavity to be treated, whereby preferably shot balls of tungsten carbide are utilized.
- the shot balls have a polished surface.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
Claims (28)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004059592.5 | 2004-12-10 | ||
DE102004059592 | 2004-12-10 | ||
DE102004059592.5A DE102004059592B4 (en) | 2004-12-10 | 2004-12-10 | Method for surface blasting of cavities, in particular of cavities on gas turbines |
PCT/DE2005/002205 WO2006061004A2 (en) | 2004-12-10 | 2005-12-07 | Method for surface blasting cavities, particularly cavities in gas turbines |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090095042A1 US20090095042A1 (en) | 2009-04-16 |
US7644599B2 true US7644599B2 (en) | 2010-01-12 |
Family
ID=35840504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/792,756 Expired - Fee Related US7644599B2 (en) | 2004-12-10 | 2005-12-07 | Method for surface blasting cavities, particularly cavities in gas turbines |
Country Status (5)
Country | Link |
---|---|
US (1) | US7644599B2 (en) |
EP (1) | EP1833641A2 (en) |
CA (1) | CA2589964C (en) |
DE (1) | DE102004059592B4 (en) |
WO (1) | WO2006061004A2 (en) |
Cited By (10)
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US20090123224A1 (en) * | 2007-10-11 | 2009-05-14 | Airbus France | Method for assembling a fatigue-resistant mechanical joint |
US20090301152A1 (en) * | 2006-08-04 | 2009-12-10 | Mtu Aero Engines Gmbh | Cover element for a sonotrode and peening chamber arrangement for the surface peening of components |
US20100037669A1 (en) * | 2006-12-13 | 2010-02-18 | Mtu Aero Engines Gmbh | Device and method for the surface peening of a component of a gas turbine |
US20110030434A1 (en) * | 2008-04-18 | 2011-02-10 | Snecma | Method for ultrasound shot-blasting of turbomachine parts |
US20120184184A1 (en) * | 2009-08-21 | 2012-07-19 | Snecma | Tool for machining a cmc by milling and ultrasonic abrasion |
US20140000330A1 (en) * | 2012-06-27 | 2014-01-02 | Hitachi-Ge Nuclear Energy Ltd. | Method of Executing Shot Peening |
US9889539B1 (en) | 2017-08-18 | 2018-02-13 | General Electric Company | Converting residual surface stress in internal opening of additively manufactured component |
US10493594B2 (en) | 2016-04-12 | 2019-12-03 | General Electric Company | Apparatus and method for peening of machine components |
US20200238475A1 (en) * | 2019-01-29 | 2020-07-30 | General Electric Company | Peening Coated Internal Surfaces of Turbomachine Components |
US20230080208A1 (en) * | 2020-05-29 | 2023-03-16 | Jiangsu University | Device for double-sided processing through single shot peening |
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DE102007009470A1 (en) * | 2007-02-27 | 2008-08-28 | Daimler Ag | Shot-peening mask for gas turbine gear wheel tooth defines limits of area for differential treatment |
DE102007029491A1 (en) | 2007-06-26 | 2009-01-02 | Mtu Aero Engines Gmbh | Method and device for surface blasting of a component in the region of a passage opening |
DE102010006094B4 (en) * | 2010-01-28 | 2013-06-27 | Siemens Aktiengesellschaft | Process for surface hardening a component of a wind turbine |
FR3061055B1 (en) * | 2016-12-26 | 2019-07-26 | Safran Aircraft Engines | DEVICE FOR PROCESSING A METAL PIECE, METHOD AND ASSEMBLY OF PROJECTILES THEREFOR |
CN107338350A (en) * | 2017-08-07 | 2017-11-10 | 沈阳航空航天大学 | A kind of ultrasonic shot peening intensifying device of bore area |
CN107488779A (en) * | 2017-08-07 | 2017-12-19 | 沈阳航空航天大学 | A kind of reflection type ultrasonic shot peening strengthening device of bore area |
CN112589118B (en) * | 2020-10-30 | 2023-07-14 | 北京航天控制仪器研究所 | Laser selective melting forming titanium alloy valve body part inner cavity cleaning method based on projectile impact |
CN114941066B (en) * | 2022-05-27 | 2023-06-02 | 南京航空航天大学 | Liquid nitrogen cooled ultrasonic shot peening device and method |
CN115011771A (en) * | 2022-06-10 | 2022-09-06 | 中国航发北京航空材料研究院 | Pellet type ultrasonic impact strengthening device for bolt hole of turbine shaft and strengthening method thereof |
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2004
- 2004-12-10 DE DE102004059592.5A patent/DE102004059592B4/en not_active Expired - Fee Related
-
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- 2005-12-07 WO PCT/DE2005/002205 patent/WO2006061004A2/en active Application Filing
- 2005-12-07 EP EP05817204A patent/EP1833641A2/en not_active Ceased
- 2005-12-07 US US11/792,756 patent/US7644599B2/en not_active Expired - Fee Related
- 2005-12-07 CA CA2589964A patent/CA2589964C/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
WO2006061004A3 (en) | 2006-08-03 |
US20090095042A1 (en) | 2009-04-16 |
CA2589964C (en) | 2013-08-06 |
DE102004059592B4 (en) | 2014-09-04 |
DE102004059592A1 (en) | 2006-05-04 |
EP1833641A2 (en) | 2007-09-19 |
WO2006061004A2 (en) | 2006-06-15 |
CA2589964A1 (en) | 2006-06-15 |
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